CN112709539A - Heave compensation device and method for deepwater drilling water-resisting casing - Google Patents
Heave compensation device and method for deepwater drilling water-resisting casing Download PDFInfo
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- CN112709539A CN112709539A CN202011603031.8A CN202011603031A CN112709539A CN 112709539 A CN112709539 A CN 112709539A CN 202011603031 A CN202011603031 A CN 202011603031A CN 112709539 A CN112709539 A CN 112709539A
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- riser
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
- E21B19/09—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string
Abstract
The invention discloses a heave compensation device and a heave compensation method for a marine riser for deepwater drilling, which comprises a floating platform and a marine riser arranged in a deepwater environment, wherein the upper part of the marine riser penetrates through the floating platform, two groups of telescopic cylinders are vertically arranged on the floating platform positioned at two sides of the marine riser, a clamp is horizontally arranged between the end parts of piston rods of the two groups of telescopic cylinders, and the upper part of the marine riser is clamped and fixed by the clamp; when the water level rises, the floating platform rises, and a piston rod of the telescopic cylinder retracts, so that the riser is not pulled up by the floating platform; when the water level descends, the floating platform sinks, and a piston rod of the telescopic cylinder extends out, so that the waterproof casing pipe is not pressed by the floating platform. The invention can ensure that the bottom pipe shoe of the water-resisting casing pipe is basically kept fixed when the water level changes and the floating platform floats and sinks, and the drilling work is not influenced.
Description
Technical Field
The invention relates to a riser for deepwater drilling, in particular to a heave compensation device and method for a riser for deepwater drilling.
Background
The water-resisting casing for deep water drilling is formed by connecting a plurality of casing pipes in series. The bottom pipe shoe of the riser is fixed below the mud line, and the upper part of the riser is fixed generally in the following ways:
(1) the upper pipe orifice is fixed on the drilling platform, and the mode is mainly used for an overhead or framework type drilling platform;
(2) the upper part adopts a floating body floater to right the riser, and the drilling platform is relatively separated from the riser. The method is mainly suitable for large-diameter marine risers and offshore drilling platforms;
(3) the upper part of the floating drilling platform is directly fixed on the floating drilling platform, and the floating drilling platform is suitable for the floating drilling platform with shallow water depth and small water level amplitude.
The fixing modes of the upper parts of the marine riser sleeves are difficult to be suitable for deepwater drilling floating platforms with large water level amplitude. Such as: in the small-caliber drilling construction of the deepwater reservoir, in order to ensure the smooth drilling construction, the water-resisting casing pipe must be firmly fixed below a mud line, so that the effect of isolating a covering layer and a water body is achieved, and the normal circulation of drilling flushing fluid is ensured. At the same time, the string of casing that makes up the riser must also be recovered after the completion of the drilling task. Compared with an offshore oil drilling platform, the diameter of a small-caliber drilling water-stop casing of a deep water reservoir is relatively small, the slenderness ratio of a casing string is large, the casing string is flexible, if the pipe orifice of the water-stop casing is rigidly fixed on a deep water drilling floating type platform, when the water level rises, the water-stop casing can move upwards along with the rising of the floating type platform in an axial direction to pull out a covering layer for a certain depth, so that a hole-pulling section collapses, and the isolation fails; when the water level drops, the riser can move axially downwards along with the drop of the floating platform, so that the riser string is pressed and bent or even broken, and huge engineering economic loss and construction period delay are caused.
Disclosure of Invention
The invention aims to solve the technical problem that the existing marine riser for deep water drilling is easy to have isolation failure or the existing marine riser is bent and broken, and provides a device and a method for compensating the heave of the marine riser for deep water drilling, which avoid the isolation failure or the bending and breaking of the marine riser through water level compensation.
To solve the above technical problem, the present invention provides a heave compensation device for a deepwater drilling riser, comprising a floating platform and a riser arranged in a deepwater environment, wherein the upper part of the riser passes through the floating platform, and:
two groups of telescopic cylinders are vertically arranged on the floating platform positioned on two sides of the marine riser, a clamp is horizontally arranged between the end parts of piston rods of the two groups of telescopic cylinders, and the upper part of the marine riser is clamped and fixed by the clamp;
when the water level rises, the floating platform rises, and a piston rod of the telescopic cylinder retracts, so that the riser is not pulled up by the floating platform;
when the water level descends, the floating platform sinks, and a piston rod of the telescopic cylinder extends out, so that the waterproof casing pipe is not pressed by the floating platform.
According to the invention, the telescopic cylinder is arranged on the floating platform, the upper part of the marine riser is floatingly supported by the piston rod of the telescopic cylinder, so that the floating platform for water drilling and the marine riser are in a floating support state, when the water level rises, the piston rod of the telescopic cylinder retracts, the marine riser is not pulled up by the floating platform, the bottom of the marine riser is lifted and pulled, and the compensation during the rising of the water level is realized; when the water level descends, a piston rod of the telescopic cylinder extends out, so that the waterproof casing pipe moves upwards relative to the floating platform, the casing pipe string is prevented from being bent and broken by the floating platform, the compensation during the water level descending is realized, the casing pipe string is protected, and meanwhile, the upper end of the waterproof casing pipe is in a pulled state by adjusting the extending length of the piston rod.
In order to realize automatic compensation when the water level rises or falls, a piston rod of the telescopic cylinder is provided with a displacement sensor for detecting the displacement of the piston rod, a water level sensor for detecting the environmental water level is arranged in the deep water environment, signal output lines of the displacement sensor and the water level sensor are respectively connected into a control system of the telescopic cylinder, and the control system calculates a water level change value delta HSAnd judging the water level variation value delta HSIf the water level exceeds the safe deformation value of the marine riser, if the water level changes by a value delta HSAnd if the safe deformation value of the marine riser exceeds the safe deformation value of the marine riser, controlling the piston rod of the telescopic cylinder to move along the direction opposite to the water level change, wherein the displacement change value delta H of the piston rod of the telescopic cylinderj＝△HSPreventing the riser from being pulled up or forced by the floating platform; if the water level variation value Delta HSThe position of the piston rod of the telescopic cylinder is kept unchanged when the value is smaller than the safe deformation value of the marine riser, namely the displacement change value delta H of the piston rod of the telescopic cylinderj＝0。
Preferably, the displacement sensor is a pull wire encoder displacement sensor.
Preferably, signal output lines of the displacement sensor and the water level sensor are respectively connected to a dual-loop digital display meter, so that a real-time value of the water level and a real-time value of the displacement are directly displayed through the dual-loop digital display meter.
Preferably, the telescopic cylinder is a hydraulic oil cylinder with a hydraulic lock, so that the installation height of the marine riser is kept stable.
Preferably, the two groups of telescopic cylinders are symmetrically arranged on two sides of the marine riser, and the two groups of telescopic cylinders adopt telescopic cylinders with the same specification so as to ensure that the clamp holder can be stably supported and moved.
Preferably, the gripper is a deadweight gripper.
Preferably, the dead weight formula holder includes shell and a pair of dead weight formula slips, the inner chamber of shell sets up to the taper hole of V type, the inclined plane cooperation installation in the taper hole dead weight formula slips, and two dead weight formula slips is installed relatively, makes two enclose in the middle of the dead weight formula slips and form sleeve pipe installation space. Therefore, the self-weight type slip can clamp the water-proof casing pipe under the action of gravity, and the self-weight type slip can be driven to move upwards along the taper hole when the water-proof casing pipe moves upwards, so that the automatic unlocking of the water-proof casing pipe is realized.
Based on the same invention concept, the invention also provides a heave compensation method for the deepwater drilling water-resisting casing, which comprises the following steps:
the upper part of the marine riser is in clearance fit with and penetrates through the floating platforms, two groups of telescopic cylinders are vertically arranged on the floating platforms on the two sides of the marine riser, a clamp is fixedly arranged between the end parts of piston rods of the two groups of telescopic cylinders in a lift-car manner, and the upper part of the marine riser is clamped and fixed by the clamp;
a displacement sensor for detecting the displacement of the piston rod is arranged on the piston rod of the telescopic cylinder, a water level sensor for detecting the water level of the environment is arranged in the deep water environment, and signal output lines of the displacement sensor and the water level sensor are respectively connected into a control system of the telescopic cylinder;
the method comprises the following steps of setting a safety deformation value, a water level initial value and a piston rod displacement initial value of a marine riser in a control system, wherein the specific setting method comprises the following steps: when the marine riser is in a safe working state, adjusting a piston of the telescopic cylinder to the middle of the telescopic cylinder, setting a displacement value measured by a displacement sensor at the moment as a displacement initial value, setting a water level value measured by a water level sensor as a water level initial value, and determining a safe deformation value of the marine riser according to experience;
the water level sensor detects a real-time water level value in real time, and the control system subtracts the real-time water level value detected by the water level sensor from an initial water level value to calculate a water level change value delta HSAnd judging the water level variation value delta HSIf the water level exceeds the safe deformation value of the marine riser, if the water level changes by a value delta HSExceeding the safe deformation value of the marine riser and controlling the piston rod of the telescopic cylinderMove along the direction opposite to the water level change, and the displacement change value delta H of the piston rod of the telescopic cylinderj＝△HSPreventing the riser from being pulled up or forced by the floating platform; if the water level variation value Delta HSThe position of the piston rod of the telescopic cylinder is kept unchanged when the value is smaller than the safe deformation value of the marine riser, namely the displacement change value delta H of the piston rod of the telescopic cylinderj＝0。
Compared with the prior art, the invention has the beneficial effects that:
the floating type platform for the offshore drilling supports the marine riser through the telescopic cylinder in a floating mode, and a water level compensation method is adopted, so that the phenomenon that when the water level rises, the floating type platform floats upwards to pull up a pipe boot at the bottom of the marine riser, and the hole wall is exposed and collapsed is avoided; and the phenomenon that the marine riser is pressed, bent and broken when the floating platform descends due to the descending of the water level is avoided.
The method is suitable for the installation occasions of the deepwater marine riser with large water level amplitude variation, so as to avoid the risk of engineering failure.
The invention can be used for a large-caliber deepwater drilling floating type platform in a drilling occasion with larger water level amplitude, and can also be used for a small-caliber drilling construction of a deepwater reservoir, and the casing string needs to be recovered after completing a drilling task.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a heave compensation device for a deepwater drilling riser according to the invention.
FIG. 2 is a perspective view of the connecting structure of the telescopic cylinder and the holder of the present invention.
Fig. 3 is a perspective view of the holder of the present invention.
Figure 4 is a top view of the holder of the present invention.
FIG. 5 is a sectional view A-A showing the clamped state of the clamper of the present invention.
FIG. 6 is a sectional view A-A showing the released state of the clamp of the present invention.
Fig. 7 is a structural diagram of a hydraulic system of the telescopic cylinder according to an embodiment of the present invention, wherein an arrow indicates a moving direction of a piston rod of the telescopic cylinder.
FIG. 8 is a schematic diagram of the connection of input signals of the dual-loop digital display meter according to the present invention.
In the figure:
1-a gripper; 2-a telescopic cylinder; 3-a floating platform; 4-a pipe boot; 5-mud line; 6-a riser pipe; 7-a water level sensor; 8-a control system; 9-a displacement sensor; 10-double loop digital display meter;
11-a housing; 12-a deadweight slip; 21-casing string clamping space and drilling operation space; 111-taper hole; 121-sleeve installation space.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
For convenience of description, the relative positional relationship of the components, such as: the descriptions of the upper, lower, left, right, etc. are described with reference to the layout directions of the drawings in the specification, and do not limit the structure of the present patent.
As shown in fig. 1-8, an embodiment of the deep water drilling riser heave compensation apparatus of the present invention comprises a floating platform 3 and a riser 6 arranged in a deep water environment. The upper part of the riser 6 passes through the floating platform 3 and the lower shoe 4 of the riser 6 is placed in the mudline 5. Two groups of telescopic cylinders 2 are vertically arranged on the floating platform 3, piston rods of the two groups of telescopic cylinders 2 are arranged upwards, and a clamp 1 is horizontally and fixedly installed between the end parts of the piston rods of the two groups of telescopic cylinders 2. The middle part of the clamp holder 1 clamps and fixes the marine riser 6. The telescoping cylinder 2 and the gripper 1 act together to centralize the riser 6 and bear the weight of part of the riser 6, ensuring that the riser 6 is under tension underwater. The stroke of the telescopic cylinder 2 is the water level compensation range of the marine riser, and the support force of the telescopic cylinder is determined by the total floating weight of the casing string of the marine riser 6.
A piston rod of the telescopic cylinder 2 is provided with a displacement sensor 9 for detecting the displacement of the piston rod, a water level sensor 7 for detecting the water level of the environment is arranged in the deep water environment, and signal output lines of the displacement sensor 9 and the water level sensor 7 are respectively connected into a control system 8 of the telescopic cylinder 2. And a safe deformation value, a water level initial value and a piston rod displacement initial value of the marine riser are set in the control system 8. The riser safety deformation value is set to avoid too frequent system start-up while ensuring the safety of the riser 6.
The water level sensor 7 adopts a high-precision liquid level sensor, the displacement stroke is 2000mm, the power supply is powered by +24V, the output signal is 4-20 mA, and the precision grade is +/-0.1%.
The displacement sensor 9 is a stay wire encoder displacement sensor. The displacement stroke is 1000mm, the power supply is powered by +24V, the output signal is 4-20 mA, and the precision grade is +/-0.1%.
Meanwhile, signal output lines of the displacement sensor 9 and the water level sensor 7 are respectively connected to the dual-loop digital display meter 10, so that the real-time water level value and the real-time displacement value are directly displayed through the dual-loop digital display meter 10. The double-loop digital display meter 10 preferably adopts a DT409 double-loop digital display meter produced by field electricity, and the double-loop digital display meter is provided with a double input loop (4-20 mA input) for supplying power: alternating current 220V.
In order to ensure that the holder 1 can be stably supported and moved, the two groups of telescopic cylinders 2 are symmetrically arranged on two sides of the waterproof casing 6 in a sedan lifting mode, the two groups of telescopic cylinders 2 adopt telescopic cylinders with the same specification, and a casing string clamping space and a drilling operation space 21 are arranged between the two groups of telescopic cylinders 2.
The gripper 1 is preferably a dead weight gripper. The deadweight gripper includes a housing 11 and a pair of deadweight slips 12. The inner cavity of the shell 11 is provided with a taper hole 111 with a V-shaped axial section, and the inner inclined surface of the taper hole 111 is matched with the dead weight type slip 12. The two self-weight slips 12 are oppositely installed, so that the two self-weight slips 12 enclose a casing installation space 121.
When the water level descends, the bottom pipe shoe 4 of the riser 6 is seated to the bottom of a drill hole and supported by the bottom surface of the drill hole, the upper part of the riser 6 drives the self-weight slip 12 to slide upwards along the wall surface of the taper hole 111, the self-weight slip 12 automatically releases the riser 6 at the moment, and the riser 6 cannot descend along with the descent of the floating platform 3 due to the fact that the floating platform 3 descends along with the descent of the water level, and therefore the riser 6 is protected from being bent under pressure. When the water level rises, the floating platform 3 rises along with the rise of the water level, the self-weight slips 12 slide downwards along the wall surface of the taper hole 111 under the action of self gravity, so that the riser 6 is in a clamping state, the floating platform 3 with the riser 6 rises together, and the bottom pipe shoe 4 of the riser 6 is lifted away from the bottom surface of the drill hole. Namely, the dead weight type clamp has the characteristic of lifting and clamping along with the rising of the floating platform 3, and has the automatic loosening capacity along with the falling of the floating platform 3, thereby avoiding the bending of the riser 6.
In order to ensure that the installation height of the marine riser 6 is kept stable after the piston rod of the telescopic cylinder 2 moves in place, in the embodiment, the telescopic cylinder 2 is a hydraulic oil cylinder with a hydraulic lock.
When the invention is used, firstly, the water-resisting sleeve 6 is in a safe working state, the piston of the telescopic cylinder 2 is adjusted to the middle part of the telescopic cylinder 2, at the moment, the displacement value measured by the displacement sensor 9 is the displacement initial value, the water level value measured by the water level sensor 7 is the water level initial value, then the water level sensor 7 detects the water level real-time value, the control system 8 subtracts the water level real-time value detected by the water level sensor 7 and the stored water level initial value to obtain the water level change value delta HSAnd judging the water level variation value delta HSIf the safe deformation value of the riser is exceeded. If the water level variation value Delta HSWhen the safe deformation value of the marine riser is exceeded, the piston rod of the telescopic cylinder 2 is controlled to move along the direction opposite to the water level change by controlling the oil inlet and outlet quantity of the upper cavity or the lower cavity of the telescopic cylinder 2, and the displacement change value delta H of the piston rod of the telescopic cylinder 2j＝△HSNamely: when the water level rises, the floating platform 3 rises, oil enters the upper cavity of the telescopic cylinder 2, and the piston rod retracts; when the water level falls, it floatsThe movable platform 3 sinks, the lower cavity of the telescopic cylinder 2 is filled with oil, and the piston rod extends out, so that the up-and-down displacement of the floating platform 3 caused by the water level change is counteracted, and the waterproof casing 6 is not lifted away from the bottom of the drilled hole (when the water level rises) and cannot be bent under pressure (when the water level falls). If the water level variation value Delta HSIf the value is less than the safe deformation value of the marine riser, the position of the piston rod of the telescopic cylinder 2 is kept unchanged, namely the displacement change value delta H of the piston rod of the telescopic cylinder 2j＝0。
In this embodiment, the safe deformation value of the 150m water depth design marine riser is 20mm, and the water level compensation range and accuracy of the marine riser is 700mm ± 10 mm. In order to avoid unnecessary frequent movements of the telescopic cylinder 2, the displacement variation value Delta H of the piston rod of the telescopic cylinder 2 is adjusted according to the following principlej：
When the water level rises, the water level change value delta HSWhen the diameter is less than or equal to 20mm, delta Hj＝0；
When the water level rises, the water level change value delta HSWhen > 20mm,. DELTA.Hj＝△HS；
When the water level drops, the water level change value delta HSWhen the diameter is less than or equal to 20mm, delta Hj＝0；
When the water level drops, the water level change value delta HSWhen > 20mm,. DELTA.Hj＝△HS。
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.
Claims (9)
1. A heave compensation device for a marine riser for deep water drilling, comprising a floating platform and a marine riser arranged in a deep water environment, the upper part of the marine riser passing through the floating platform,
two groups of telescopic cylinders are vertically arranged on the floating platform positioned on two sides of the marine riser, a clamp is horizontally arranged between the end parts of piston rods of the two groups of telescopic cylinders, and the upper part of the marine riser is clamped and fixed by the clamp;
when the water level rises, the floating platform rises, and a piston rod of the telescopic cylinder retracts, so that the riser is not pulled up by the floating platform;
when the water level descends, the floating platform sinks, and a piston rod of the telescopic cylinder extends out, so that the waterproof casing pipe is not pressed by the floating platform.
2. The heave compensation device according to claim 1, wherein a displacement sensor for detecting the displacement of a piston rod is mounted on the piston rod of the telescopic cylinder, a water level sensor for detecting the environmental water level is mounted in the deep water environment, the signal output lines of the displacement sensor and the water level sensor are respectively connected to a control system of the telescopic cylinder, and the control system calculates the water level change value Δ HSAnd judging the water level variation value delta HSIf the water level exceeds the safe deformation value of the marine riser, if the water level changes by a value delta HSAnd if the safe deformation value of the marine riser exceeds the safe deformation value of the marine riser, the piston rod of the telescopic cylinder is controlled to move along the direction opposite to the water level change, and the delta Hj＝△HSIf the water level variation value Δ HSAnd if the value is less than the safe deformation value of the marine riser, the position of the piston rod of the telescopic cylinder is kept unchanged.
3. The deep water drilling riser heave compensation device of claim 2, wherein the displacement sensor is a pull-wire encoder displacement sensor.
4. The heave compensation device for the deepwater drilling riser according to claim 2, wherein the signal output lines of the displacement sensor and the water level sensor are respectively connected into a double-loop digital display meter.
5. The heave compensation device of claim 1, wherein the telescoping cylinder is a hydraulic cylinder with a hydraulic lock.
6. The heave compensation device of claim 1, wherein two sets of telescoping cylinders are symmetrically arranged on both sides of the riser.
7. The deep water drilling riser heave compensation apparatus of claim 1, wherein the gripper is a deadweight gripper.
8. The heave compensation apparatus of claim 7, wherein the deadweight gripper comprises a housing and a pair of deadweight slips, an inner cavity of the housing is provided with a V-shaped taper hole, the tapered hole is internally provided with the deadweight slips in an inclined surface fit manner, and the two deadweight slips are oppositely arranged, so that a casing installation space is formed by enclosing the two deadweight slips.
9. A method for compensating heave of a deepwater drilling riser is characterized by comprising the following steps:
the upper part of the marine riser is in clearance fit with and penetrates through the floating platforms, two groups of telescopic cylinders are vertically arranged on the floating platforms on the two sides of the marine riser, a clamp is fixedly arranged between the end parts of piston rods of the two groups of telescopic cylinders in a lift-car manner, and the upper part of the marine riser is clamped and fixed by the clamp;
a displacement sensor for detecting the displacement of the piston rod is arranged on the piston rod of the telescopic cylinder, a water level sensor for detecting the water level of the environment is arranged in the deep water environment, and signal output lines of the displacement sensor and the water level sensor are respectively connected into a control system of the telescopic cylinder;
the method comprises the following steps of setting a safety deformation value, a water level initial value and a piston rod displacement initial value of a marine riser in a control system, wherein the specific setting method comprises the following steps: when the marine riser is in a safe working state, adjusting a piston of the telescopic cylinder to the middle of the telescopic cylinder, setting a displacement value measured by a displacement sensor at the moment as a displacement initial value, setting a water level value measured by a water level sensor as a water level initial value, and determining a safe deformation value of the marine riser according to experience;
the water level sensor detects a real-time water level value in real time, and the control system subtracts the real-time water level value detected by the water level sensor from an initial water level value to calculate a water level change value delta HSAnd judging the water level variation value delta HSIf the water level exceeds the safe deformation value of the marine riser, if the water level changes by a value delta HSExceeding the safe deformation value of the marine riser, controlling the piston rod of the telescopic cylinder to move along the direction opposite to the water level change, and controlling the displacement change value delta H of the piston rod of the telescopic cylinderj＝△HSPreventing the riser from being pulled up or forced by the floating platform; if the water level variation value Delta HSThe position of the piston rod of the telescopic cylinder is kept unchanged when the value is smaller than the safe deformation value of the marine riser, namely the displacement change value delta H of the piston rod of the telescopic cylinderj＝0。
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| CN202011603031.8A CN112709539B (en) | 2020-12-29 | 2020-12-29 | Deepwater drilling riser heave compensation device and method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649560A (en) * | 2016-03-31 | 2016-06-08 | 中国石油大学(华东) | Marine floating type drilling riser flexible hanger |
| CN106639918A (en) * | 2017-01-04 | 2017-05-10 | 中国海洋石油总公司 | Suspension device and suspension method of water-secluding pipe system for deepwater well drilling |
| CN210768598U (en) * | 2019-08-30 | 2020-06-16 | 江苏省水文地质工程地质勘察院 | Wave compensation device of vertical shaft type drilling machine |
| CN214118108U (en) * | 2020-12-29 | 2021-09-03 | 中国电建集团中南勘测设计研究院有限公司 | Heave compensation device for deepwater drilling water-resisting casing |
-
2020
- 2020-12-29 CN CN202011603031.8A patent/CN112709539B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649560A (en) * | 2016-03-31 | 2016-06-08 | 中国石油大学(华东) | Marine floating type drilling riser flexible hanger |
| CN106639918A (en) * | 2017-01-04 | 2017-05-10 | 中国海洋石油总公司 | Suspension device and suspension method of water-secluding pipe system for deepwater well drilling |
| CN210768598U (en) * | 2019-08-30 | 2020-06-16 | 江苏省水文地质工程地质勘察院 | Wave compensation device of vertical shaft type drilling machine |
| CN214118108U (en) * | 2020-12-29 | 2021-09-03 | 中国电建集团中南勘测设计研究院有限公司 | Heave compensation device for deepwater drilling water-resisting casing |
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| CN112709539B (en) | 2023-06-16 |
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